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