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