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