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