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