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