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