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