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