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)(19,24,30,40)(20,32,21,26)(22,36,37,27)(25,35,43,34)(29,39,33,48)(31,46,45,41)(38,47,42,44)(2,6)(4,7)(9,10)(11,15)(12,14)(13,16)(17,19)(18,24)(20,33)(21,29)(22,31)(23,30)(25,42)(26,39)(27,41)(28,40)(32,48)(34,47)(35,44)(36,46)(37,45)(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)(30,33)(31,47)(32,36)(34,37)(39,46)(40,42)(41,48)(44,45)(2,6)(3,8)(11,16)(13,15)(17,21,23,20)(18,26,28,32)(19,29,30,33)(22,35,37,34)(24,39,40,48)(25,36,43,27)(31,44,45,47)(38,41,42,46)(1,4,5,7)(2,8,6,3)(10,14)(13,15)(19,30)(20,21)(24,40)(25,43)(26,32)(31,45)(34,35)(41,46)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.