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)(11,14)(12,16)(13,15)(17,18,23,27,22,26,30,32)(19,24,25,31,20,21,28,29)(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,15,16)(17,19,22,20)(18,21,26,24)(23,25,30,28)(27,29,32,31)(9,12,13,11)(10,14,15,16)(17,20,22,19)(18,24,26,21)(23,28,30,25)(27,31,32,29)(3,8)(5,7)(19,20)(21,24)(25,28)(29,31) involution — undirected(2,6)(5,7)(17,21,23,29,22,24,30,31)(18,25,27,20,26,28,32,19)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.