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