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