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