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