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