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