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