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