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