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