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