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