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