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