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