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