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