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