One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,8,12,9,11,18,17)(7,13,14,20,15,10,16,19)(21,22,25,29)(23,30,32,35)(24,26,33,28)(27,31,36,34)(1,2)(3,4)(5,7,9,15)(6,10,11,13)(8,16,18,14)(12,20,17,19)(22,26)(24,33)(27,35)(28,29)(30,36)(31,34)(2,4)(5,6)(7,13)(8,17)(9,11)(10,15)(12,18)(14,19)(16,20) involution — undirected(8,18)(12,17)(14,16)(19,20)(21,23,25,32)(22,27,29,36)(24,34,33,31)(26,35,28,30)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.