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