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