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