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