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