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