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