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