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