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