One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,13)(6,7)(8,11)(9,14)(10,15)(12,16)(17,18,22,20)(19,23,25,26)(21,24,29,28)(27,30,31,32)(33,34)(35,39)(36,44)(37,41)(38,42)(40,46)(43,47)(45,48)(2,7)(4,8)(9,13)(12,15)(17,19)(18,23)(20,26)(21,27)(22,25)(24,30)(28,32)(29,31)(35,42)(38,39)(43,45)(47,48) involution — undirected(2,7)(4,8)(5,14)(10,16)(19,25)(21,29)(23,26)(24,28)(33,35,37,42)(34,38,41,39)(36,45,46,43)(40,48,44,47)(1,3,6,11)(2,8,7,4)(5,10,14,16)(9,15,13,12)(17,20,22,18)(19,26,25,23)(21,24,29,28)(27,30,31,32)(33,34)(35,38)(36,40)(37,41)(39,42)(43,47)(44,46)(45,48)(1,4,6,8)(2,3,7,11)(5,12,14,15)(9,10,13,16)(17,21,22,29)(18,24,20,28)(19,27,25,31)(23,30,26,32)(33,35)(34,39)(36,43)(37,42)(38,41)(40,48)(44,47)(45,46)(1,5,6,14)(2,9,7,13)(3,10,11,16)(4,12,8,15)(17,19)(18,23)(20,26)(21,27)(22,25)(24,30)(28,32)(29,31)(33,36,37,46)(34,40,41,44)(35,43,42,45)(38,47,39,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.