One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,11)(4,8)(5,9)(6,10)(7,13)(12,16)(14,15)(17,18)(19,27)(20,26)(21,25)(22,24)(23,28)(29,31)(30,32)(33,34,36,40,37,39,43,46)(35,38,42,45,41,44,47,48)(1,3)(2,7)(4,12)(5,14)(6,13)(8,15)(9,16)(10,11)(17,19)(18,23)(20,30)(21,29)(22,28)(24,27)(25,32)(26,31)(35,41)(38,44)(42,47)(45,48) involution — undirected(1,4,6,5)(2,8,10,9)(3,12,13,14)(7,15,11,16)(18,24)(19,28)(25,26)(29,30)(33,35)(34,38)(36,42)(37,41)(39,44)(40,45)(43,47)(46,48)(1,5,6,4)(2,9,10,8)(3,12,13,14)(7,15,11,16)(17,20,22,21)(18,25,24,26)(19,29,28,30)(23,31,27,32)(2,10)(7,11)(8,9)(15,16)(17,21,22,20)(18,26,24,25)(19,29,28,30)(23,31,27,32)(34,39)(35,41)(40,46)(42,47)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.