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