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