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