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