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