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