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