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