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