One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,7)(3,8,4,6)(17,18)(19,23)(20,27)(21,25)(22,26)(24,28)(29,31)(30,32)(1,2)(3,6)(4,8)(5,7)(9,10)(11,15)(12,14)(13,16)(17,19)(18,23)(20,27)(21,26)(22,25)(24,30)(28,32)(29,31) involution — undirected(1,2)(3,8)(4,6)(5,7)(9,11)(10,13)(12,16)(14,15)(17,20,23,30,22,29,21,28)(18,24,25,31,26,32,19,27)(1,3,5,4)(2,6,7,8)(11,16)(13,15)(17,18)(19,21)(20,24)(22,26)(23,25)(27,28)(29,32)(30,31)(1,4,5,3)(2,6,7,8)(10,14)(13,15)(17,21,22,23)(18,25,26,19)(20,28,29,30)(24,31,32,27)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.