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