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