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