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)(17,18,22,25)(19,27,30,32)(20,29,23,24)(21,31,28,26)(2,5)(3,8)(9,11)(10,13)(12,16)(14,15)(17,19,21,29,22,30,28,24)(18,23,26,27,25,20,31,32)(1,3,4,8)(2,6,5,7)(10,14)(11,16)(17,20)(18,24)(19,26)(21,32)(22,23)(25,29)(27,28)(30,31)(2,5)(6,7)(10,14)(11,16)(18,25)(20,23)(26,31)(27,32) involution — undirected(2,5)(6,7)(10,14)(13,15)(17,19,28,24,22,30,21,29)(18,23,31,32,25,20,26,27)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.