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