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