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