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