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