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