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