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