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