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