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