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