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