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