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