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