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