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