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