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