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