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