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