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