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