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