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