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