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