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