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