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