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