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