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