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