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