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