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