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