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